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But your mouse starts against the edge of the screen, so any unintended travel is naturally going to be away from the edge, so you can't really rely on Fitts to help.

I'm also not convinced that you having close buttons appear/disappear depending on what input device your using would work particularly well in practice either. Aside from being potentially confusing, it starts to introduce oddities with differing input devices (Should a stylus act more like a mouse or touch? What about Kinect? What about a mouse that supports Touch gestures?)

I don't know. Keeping the mouse against the edge seemed pretty natural to me. And you can't even leave the edge until the mouse gets about 1.5 thumbnails down the list or the list won't activate. By then your trajectory is most decidedly down.